/**
* Construct the Linux command line passed to the appliance. This is
* used by the C<direct> and C<libvirt> backends, and is simply
* located in this file because it's a convenient place for this
* common code.
*
* The C<appliance_dev> parameter must be the full device name of the
* appliance disk and must have already been adjusted to take into
* account virtio-blk or virtio-scsi; eg C</dev/sdb>.
*
* The C<flags> parameter can contain the following flags logically
* or'd together (or 0):
*
* =over 4
*
* =item C<APPLIANCE_COMMAND_LINE_IS_TCG>
*
* If we are launching a qemu TCG guest (ie. KVM is known to be
* disabled or unavailable). If you don't know, don't pass this flag.
*
* =back
*
* Note that this function returns a newly allocated buffer which must
* be freed by the caller.
*/
char *
guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,
int flags)
{
CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (argv);
char *term = getenv ("TERM");
bool tcg = flags & APPLIANCE_COMMAND_LINE_IS_TCG;
char *ret;
/* We assemble the kernel command line by simply joining the final
* list of strings with spaces. This means (a) the strings are not
* quoted (it's not clear if the kernel can handle quoting in any
* case), and (b) we can append multiple parameters in a single
* argument, as we must do for the g->append parameter.
*/
/* Force kernel to panic if daemon exits. */
guestfs_int_add_string (g, &argv, "panic=1");
#ifdef __arm__
guestfs_int_add_sprintf (g, &argv, "mem=%dM", g->memsize);
#endif
#ifdef __i386__
/* Workaround for RHBZ#857026. */
guestfs_int_add_string (g, &argv, "noapic");
#endif
/* Serial console. */
guestfs_int_add_string (g, &argv, SERIAL_CONSOLE);
#ifdef EARLYPRINTK
/* Get messages from early boot. */
guestfs_int_add_string (g, &argv, EARLYPRINTK);
#endif
#ifdef __aarch64__
guestfs_int_add_string (g, &argv, "ignore_loglevel");
/* This option turns off the EFI RTC device. QEMU VMs don't
* currently provide EFI, and if the device is compiled in it
* will try to call the EFI function GetTime unconditionally
* (causing a call to NULL). However this option requires a
* non-upstream patch.
*/
guestfs_int_add_string (g, &argv, "efi-rtc=noprobe");
#endif
/* RHBZ#1404287 */
guestfs_int_add_string (g, &argv, "edd=off");
/* For slow systems (RHBZ#480319, RHBZ#1096579). */
guestfs_int_add_string (g, &argv, "udevtimeout=6000");
/* Same as above, for newer udevd. */
guestfs_int_add_string (g, &argv, "udev.event-timeout=6000");
/* Fix for RHBZ#502058. */
guestfs_int_add_string (g, &argv, "no_timer_check");
if (tcg) {
const int lpj = guestfs_int_get_lpj (g);
if (lpj > 0)
guestfs_int_add_sprintf (g, &argv, "lpj=%d", lpj);
}
/* Display timestamp before kernel messages. */
guestfs_int_add_string (g, &argv, "printk.time=1");
/* Saves us about 5 MB of RAM. */
guestfs_int_add_string (g, &argv, "cgroup_disable=memory");
/* Disable USB, only saves about 1ms. */
guestfs_int_add_string (g, &argv, "usbcore.nousb");
/* Disable crypto tests, saves 28ms. */
guestfs_int_add_string (g, &argv, "cryptomgr.notests");
/* Don't synch TSCs when using SMP. Saves 21ms for each secondary vCPU. */
guestfs_int_add_string (g, &argv, "tsc=reliable");
/* Don't scan all 8250 UARTS. */
guestfs_int_add_string (g, &argv, "8250.nr_uarts=1");
/* Tell supermin about the appliance device. */
if (appliance_dev)
guestfs_int_add_sprintf (g, &argv, "root=%s", appliance_dev);
/* SELinux - deprecated setting, never worked and should not be enabled. */
if (g->selinux)
guestfs_int_add_string (g, &argv, "selinux=1 enforcing=0");
else
guestfs_int_add_string (g, &argv, "selinux=0");
/* Quiet/verbose. */
if (g->verbose)
guestfs_int_add_string (g, &argv, "guestfs_verbose=1");
else
guestfs_int_add_string (g, &argv, "quiet");
/* Network. */
if (g->enable_network)
guestfs_int_add_string (g, &argv, "guestfs_network=1");
/* TERM environment variable. */
if (term && valid_term (term))
guestfs_int_add_sprintf (g, &argv, "TERM=%s", term);
else
guestfs_int_add_string (g, &argv, "TERM=linux");
/* Handle identifier. */
if (STRNEQ (g->identifier, ""))
guestfs_int_add_sprintf (g, &argv, "guestfs_identifier=%s", g->identifier);
/* Append extra arguments. */
if (g->append)
guestfs_int_add_string (g, &argv, g->append);
guestfs_int_end_stringsbuf (g, &argv);
/* Caller frees. */
ret = guestfs_int_join_strings (" ", argv.argv);
if (ret == NULL)
g->abort_cb ();
return ret;
}
/**
* Construct the Linux command line passed to the appliance. This is
* used by the C<direct> and C<libvirt> backends, and is simply
* located in this file because it's a convenient place for this
* common code.
*
* The C<appliance_dev> parameter must be the full device name of the
* appliance disk and must have already been adjusted to take into
* account virtio-blk or virtio-scsi; eg C</dev/sdb>.
*
* The C<flags> parameter can contain the following flags logically
* or'd together (or 0):
*
* =over 4
*
* =item C<APPLIANCE_COMMAND_LINE_IS_TCG>
*
* If we are launching a qemu TCG guest (ie. KVM is known to be
* disabled or unavailable). If you don't know, don't pass this flag.
*
* =back
*
* Note that this function returns a newly allocated buffer which must
* be freed by the caller.
*/
char *
guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,
int flags)
{
char root[64] = "";
char *term = getenv ("TERM");
char *ret;
bool tcg = flags & APPLIANCE_COMMAND_LINE_IS_TCG;
char lpj_s[64] = "";
if (appliance_dev)
snprintf (root, sizeof root, " root=%s", appliance_dev);
if (tcg) {
int lpj = guestfs_int_get_lpj (g);
if (lpj > 0)
snprintf (lpj_s, sizeof lpj_s, " lpj=%d", lpj);
}
ret = safe_asprintf
(g,
"panic=1" /* force kernel to panic if daemon exits */
#ifdef __arm__
" mem=%dM"
#endif
#ifdef __i386__
" noapic" /* workaround for RHBZ#857026 */
#endif
" " SERIAL_CONSOLE /* serial console */
EARLYPRINTK /* get messages from early boot */
#ifdef __aarch64__
" ignore_loglevel"
/* This option turns off the EFI RTC device. QEMU VMs don't
* currently provide EFI, and if the device is compiled in it
* will try to call the EFI function GetTime unconditionally
* (causing a call to NULL). However this option requires a
* non-upstream patch.
*/
" efi-rtc=noprobe"
#endif
" udevtimeout=6000"/* for slow systems (RHBZ#480319, RHBZ#1096579) */
" udev.event-timeout=6000" /* for newer udevd */
" no_timer_check" /* fix for RHBZ#502058 */
"%s" /* lpj */
" printk.time=1" /* display timestamp before kernel messages */
" cgroup_disable=memory" /* saves us about 5 MB of RAM */
" usbcore.nousb" /* disable USB, only saves about 1ms */
" cryptomgr.notests" /* disable crypto tests, saves 28ms */
" tsc=reliable" /* don't synch TSCs when using SMP,
saves 21ms for each secondary vCPU */
" 8250.nr_uarts=1" /* don't scan all 8250 UARTS */
"%s" /* root=appliance_dev */
" %s" /* selinux */
" %s" /* quiet/verbose */
"%s" /* network */
" TERM=%s" /* TERM environment variable */
"%s%s" /* handle identifier */
"%s%s", /* append */
#ifdef __arm__
g->memsize,
#endif
lpj_s,
root,
g->selinux ? "selinux=1 enforcing=0" : "selinux=0",
g->verbose ? "guestfs_verbose=1" : "quiet",
g->enable_network ? " guestfs_network=1" : "",
term ? term : "linux",
STRNEQ (g->identifier, "") ? " guestfs_identifier=" : "",
g->identifier,
g->append ? " " : "", g->append ? g->append : "");
return ret;
}
